(Credit: Bill Cooper/Royal Opera) Christof Loy’s Olivier Award-winning production of Wagner’s “Tristan und Isolde” returns to The Royal Opera, Covent Garden on April 27, 2020. The revival production is set to star Wagnerian Swedish tenor Michael Weinius and German soprano Ricarda Merbeth making their Royal Opera debuts. The two will be joined by German bass Franz-Josef Selig as King Marke {…}